Edwin pope



(Model.)

n E. POPE. Telephonie Signaling Apparatus. No. 240,335.` y PatentedApril19,1881.

n4 PETERS, FHOTGUTRQGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OEEICE.

EDI/NIN POPE, OF QUEBEC, CANADA.

TELEPHONE SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 240,335, dated April19, 1881.

Application led April 19, 1880. (Model.)

To all whom 'it may concern Beit known that I, EDWIN POPE, of the cityof Quebec, in the county and Province of Quebec, Canada, have inventedcertain new and useful improved mechanism for calling and telegraphingto and from individual stations on any telephonie or telegraphiccircuit; and I do hereby declare that the following is afull, clear, andexact description ofthe same.

The special object of my invention is to do away with the inconvenienceat present existing on telephonie circuits in which, when one station isto be notified, the bells or nlls of all the others on that circuit aresounee. but it may also be used with great advantage on any telegraphicline, the particular bene'tit being that by using my mechanism anycommunication between two stations is strictly private, and not capableof being intercepted at any other station on the line. It may be brieflydescribed as consisting of a compound wheel released by the operator andrevolving in unison with the wheels at other stations, so as (at adifferent point in its circumference for each station in the circuit) tooperate the striker, and immediately afterward, through a special leveroperated by the armature, to cut in 7 the telephone or other instrument,which remains in circuit until a current is sent over the line. Thewheel in its revol ntion announces automatically at thecontrolling-cnice the number or other distinguishing-mark ot' itsstation.

The above arrangement is slightly modified where a long length of lineis to be telegraphed over; but for full comprehension of the inventionreference must be had to the annexed drawings, in which- Figure 1 isaplan of way-station apparatus with the parts in their norma-l position.Fig. 2 is a plan showing position of parts when the telephone is placedin circuit. Fiv. 3 is a detail ofthe wheel Fig. 4t, a plan ofcontrollingoice apparatus, and Fig. 5, a plan of appara tus for a Morsecircuit over long lines.

Similarl letters ofreference indicate like parts.

M M are electro-magnets, of any usual conf struction, and A thearma-ture, to which is atto :"lied, near its pivot-point a, aspring-rod, B, carrying the striker or hammer B, B2 being the bell, andB3 the knob and pin by which hammer is operated.

K is a key, arranged as shown with relation to the wheel W, presently tobe described, pivoted at 7c to the case inclosing appara-tus, and havingone end weighted, as shown at K', and the other provided with a pin, K2,against which 'presses the spring S, constructed preferably as shown,and connected to the line. The arm K3 presses against the rabbeted endof the hammer-B, and holds the key in the position shown in Fig. 1. Thiswheel IV and the wheel X are mounted on the same spindle, the formerbeing made, as shown, ot' somewhat greater diameter than the latter, soas to leave a space between X and the raised rim or periphery ot' WV, inwhich are cut obliquely two openings,

(marked, respectively, I and O.) O is a stop inthe space between thewheels, and X a deep indentin the perilihery ofthe wheel X, the side ot'this, the stop O', and the edge or' the opening O being in onecontinuous line. The periphery of X is, as shown,formed with ratchet.-teeth between the openings O and I. The position of the opening I isvaried on the wheel of each station.

W and WW are pins or projections on the outside of the periphery of W,against one ot' which, according as a current is on or not, presses thepin A on the armature to hold the wheel still.

Y and Y are projections from the periphery of IV, which, as the wheelrevolves, come in contact with a projection, S', on the spring S,breaking the contact between the spring and key K, and thus interruptingthe circuit. rPhe position of the pin Y is altered in each wheel tocorrespond with the opening I. Z Z are similar projections acting in thesame way, but differing in number and arrangement at each station, so asto form a distinguishing letter or s'ignal.

A2 is an arm or projection from the armature A, which engages with andmoves positively in either direction a cut-oft' lever, O, this beingthereby alternately brought in contact with and removed from anadjustable screw, T, connected with the line and the telephone or otherinstrument, (shown at E, Fig. l.) Electrical connection is made throughthe IOO to interfere with the working ot' the magnet, and at the sametime strengthen the stroke of the bell and make the working of the leverC more certain and operative.

The above are the devices comprised in the apparatus for any way-stationin the circuit. The corresponding arrangement of the apparatus at thecontrolling-ottico will now be described. In this case (see Fig. 4) V isthe disk or flat wheel, perforated, as shown, at c o, U being the pin tobe inserted into either of these, and U' a iixed pin, which always putsthe line to the ground. V' and V2 are pins corresponding exactly to thepins WT' and W2 on the wheel IV, and the several apertures o c are atthe same distances from these pins as the openings I in the wheels atthe several stations from the pins WV and W2, so as to make theinterruption to the currentsynchronous. These interruptions are made byplacing the pin U in the aperture corresponding to the opening in thewheel ot' the station to bc called.

The operation of my invention is follows: When at any way-station in thecircuit itis desired to communicate with the controllingoflice the knobB3 is pressed in, bringing` the hammer B in contact with the bell B2,thus releasing the arm K3, and allowing the weighted end K2 of the keyto bring its upper part and with it the spring S in close proximity withthe periphery of the wheel \V. By this means the pin Y' comes in contactwith the projection S' on the spring S, disengaging this latter from thepin K2 on the key, and the current is thereby momentarily interrupted,thus allowing the whole train ofwheels, one at each station, to revolvein unison (by means ot clockwork or other suitable mechanism) until thepin A' on the armature ot' the calling-station comes opposite theopening I in its wheel, when, as the current is again interrupted by theprojection Y coming in contact with the projection S', as before, thearmature drops, so as tojallow the pin A' to drop through the opening Iupon the ratchet-teeth ot' the wheel X, which, as the wheel revolves,give vibratory motion to the armature A and rod B' and sound the call,the projections Z Z causing momentary interrupt-ions to the current, andthus indicating to the central office by their number and grouping whichoiiice is calling. The interruptions are received on a relay, bell,sounder, or register in the usual way. Al though, as before mentioned,all thewheels ot' a circuit revolve in unison, no effect is produced bysuch revolution unless the key K has been dropped and the spring S hasbeen brought in contact With the wheel, which only happens at thecalling-station. It will be easily seen that although the wheels revolvein unison at each station the alarm is sounded but by one, and that onlythat one will be put in circuit, as will be presently explained.

On the wheel IV may be placed an addition al escapement-pin, to preventthe sounding of false calls by interruptions to the current caused byaccidents to the line or batteries.

Where a call is given the armature is dropped to release the escapelnentand immediately raised again, passing over such extra pin 5 but ifdropped by an accidental interruption to the line the armature remainsdown and checks the wheel.

On arriving at the end of the ratchet-teeth the armature, either by thespring attached thereto or by its own gravity, falls lower, the pin A'thereon dropping into the indent X', the pin A2, as it does so, comingagainst the lower part of the lever G and separating it from contactwith the turn-screw T, thus cutting in or placing in circuit thetelephone or telegraphic instrument. The wheel still revolving carriesthe pin A' from the indent X', along the stop O', and out through theopening O till it comes in contact with and is stopped by the pin W',the armature in this position, however, not acting upon the lever C tobring it into contact with the screwl until a current is let in, whenthe armature is brought upto the position shown in Fig. l, the wheelthen revolving till the pin 72, striking against that A', stops andholds it. The key K is also, by the same movement, restored to theposition shown in Fig. l by a pin on the wheel XV, with the upper faceot' the key coming in contact. When the wheel is in the position shownthe dropping of the key K has no effect, as it does not interrupt thecurrent, contact being still made between the key and the spring S byreason ot' there being no pin at that point on the wheel W to raise thespring S and break the circuit.

To call any way-station from the connecting-office all that is needed isto place the pin U in that perforation u of the disk V which correspondsin situation to the opening I ot" IOC the station to be called, and thento release the wheel by a momentaryinterruption ot' the battery-current.The wheels then revolve, and the current is again interrupted by themovable pin U, and the action goes on as described.

It will, of course, be understood from the foregoing that as theperforations n o in the disk V at the central or connecting stationcorrespond with the openings I in the periphcries of the wheels ot' theseveral way-stations, when the current is interrupted by the movable pinU, placed in any one of such perforations, the armature at the stationin which the gap l corresponds with such pert'orations drops through thearmatures ofthe other stations, then resting on the peripheries of theseveral wheels, and being' drawn up again by the magnets as the currentis immediately reestablished.

Over lon g lines and for a Morse circuit, although the signalingapparatus is the same,

the arrangement of the other parts will require to be varied, preferablyin some such way as that shown in Fig. 5, one current heilig used forsignaling purposes and the other for transmitting messages, and apolarized relay, P It, arranged to work the magnets M with a localbattery. When the line is not in use a IIO current-say positiveis puton, which causes the polarized relay to close its local circuit,

tS, as before described. The controlling oice receives this letter ornumber on an ordinary relay, and putting in the pin for that ofcereverses the current for a movement, which starts all the wheels, andthen checks them again at the point W by putting on the negative currentand keeping it on until the business is transacted. Where aninterruption of the current is made by the controlling ofice in thedirect-working plan a reversal of current is made in this.

An indicator may, if' desired, be used at each station to show that acall has been given, and lthe apparatus is in every case inclosed toprevent interference therewith.

What I claim is as follows:

l. In a telegraphic switch and alarm, an armature in its normal positionheld up by magnets, and when released at a certain point by theinterruption of current to said magnets dropping through the peripheryof a revolving Wheel or disk into a lower position, whence it isautomatically restored to its normal position by the revolution of thedisk or wheel, all substantially as herein set forth, and for thepurposes described.

2. In a telephone signal-switch, the combination, for cutting aninstrument in and out of circuit, of the pivoted lever U, brought incontact with and detached from stop 'I by magnet M and wheels W and Xacting upon and through the armature A.

3. The combina-tion of the lever C, magnet M, armature A, and doublewheel, with openings in outer rim and indent in inner disk, all asherein set forth, and for the purposes described.

4. The combined wheels W and X,with fixed opening O and varied opening Iin periphery ot' former, and ratchet-teeth and indent on latter, all asand for the purposes set forth.

5. The combination ot' the wheel W, with projections on periphery ofsame, key K, and spring S, all constructed and operating substantiallyas set forth.

6. The combination f the Wheel W, key K, spring S, and hammer B, as andfor the purposes herein described.

7 The disk V, with perforations corresponding to openings I in thewheels W of the several stations in any circuit, and movable pin forinterrupting or changing the current, all as herein set forth.

EDWIN POPE.

Wi tncsses J AMES BARCLAY, Trios. SIMPSON.

